Kanye West and Kim Kardashian having a baby

Kim Kardashian is set to become a mom – the reality TV star is expecting a baby with rapper beau Kanye West.

West shared the good news with hundreds of concertgoers during a show in Atlantic City, N.J., on Sunday night, revealing Kardashian is about 12 weeks along. He told the audience to “stop the music and make noise for my baby mama” in reference to his girlfriend, who was in the crowd.

Members of Kardashian’s family also took to Twitter.com to share their excitement – Khloe Kardashian Odom wrote, “KIMYE!!!!! Keeping secrets is hard with so many family members! Especially when you are so freaking excited!!!!! LOVE is everything!!!!”

Her older sister, Kourtney Kardashian, who has two children with longtime beau Scott Disick, also took to Twitter and exclaimed, “Been wanting to shout from the rooftops with joy and now I can! Another angel to welcome to our family. Overwhelmed with excitement!”